Newly elected congressman Mark Sanford will take his oath of office Wednesday, a week after winning his political comeback bid in South Carolina.

The Republican, whose extramarital affair derailed his once-promising career, will take his oath of office around 5:15 p.m. ET in the House chamber, his campaign announced. Sanford defeated Democrat Elizabeth Colbert Busch in a special election May 7 in South Carolina's 1st Congressional District.

Sanford is succeeding Republican Tim Scott, who was appointed to the U.S. Senate. Sanford held the seat from 1995 to 2001, then was elected governor of South Carolina. It was during his second term as governor that Sanford admitted he was having an affair with Maria Belen Chapur, now his fiancée.

Sanford was known as a renegade during his first stint in Congress and often bucked the House Republican leadership. In this campaign, Sanford was abandoned by the House GOP campaign committee. He has said he's ready to move on.

"I think always past is past, and I look forward to working with the entire Republican team," Sanford said on Fox News Sunday.